What’s “recall” of MPs?

At the moment, once elected, MPs can continue in their seat until the next general election, as much as five years away, whether or not voters feel they are doing a good job of representing their constituency.

Giving voters the right of recall allows them to sack their MP early if a sufficient number want that, triggering another election.

This is a separate issue from the way we elect our politicians, though it is part of electoral reform, and could be changed by an act of parliament, so it’s not part of the question of whether AV should be adopted in the UK.